At 8:19 PM, Operations reported that a Debuncher power supply (D:QD) tripped off for the first of two times in twenty minutes on a ground fault. This did not affect the studies. Operations contacted an expert.

Friday October 20

The midnight shift began with the TeV in access, and with NuMI and MiniBooNE taking beam.

At midnight, a cold compressor for the TeV sector B3 area tripped off. Operators investigated, but left the compressor off; it will be checked in the morning.

The Pbar studies ended at 1:38 AM.

At 2:13 AM, the NuMI horn tripped off on a ground fault indication. It reset okay.

Operations prepared Pbar for access at 6:26 AM.

At 8:07 AM, a power supply expert reported that a Pbar magnet (D6Q18) might have a ground fault. The investigation continued.

The Plans for Friday and the Weekend

The TeV is on schedule to begin the D sector cooldown on Saturday night. Startup might be delayed by the results of the Pbar D6Q18 investigations.